(a2ps.info)Defining Variables

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4.9.1 Defining Variables
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 -- Configuration Setting: Variable: KEY VALUE
     Define the escape '#{KEY}' to be a short cut for VALUE.  KEY must
     not have any character from ':(){}'.

   As as example, here is a variable for 'psnup', which encloses all the
option passing one would like.  Delegations are then easier to write:
     Variable: psnup psnup -#v -q #?j|-d|| #?r||-c| -w#w -h#h

   It is strongly suggested to follow a '.' (dot) separated hierarchy,
starting with:
'del'
     for variables that are related to delegations.

'pro'
     for variables used in prologues (Note: Designing PostScript
     Prologues).  Please, specify the name of the prologue (e.g.,
     'pro.matrix.gray').

'ps'
     for variables related to PostScript matters, such as the page label
     (which is associated to 'ps.page_label'), the header etc.

'pl'
     for page label formats.  Note: Your Page Labels, the option
     '--page-label' in Note: Input Options.

'toc'
     for toc formats.  See the option '--toc' in Note: Input Options.

'user'
     for user related information.  Note: Predefined Variables.

   This naming convention has not fully stabilized.  We apologize for
the inconvenience this might cause to users.